Senior Backend Engineer, Integrations
About The Position
Horizon3 is a fast-growing, remote cybersecurity company dedicated to the mission of enabling organizations to proactively find and fix and verify exploitable attack vectors before criminals exploit them. Our flagship product, the NodeZeroTM platform, delivers production-safe autonomous pentests and other key assessment operations that scale across the largest internal, external, cloud, and hybrid cloud environments. NodeZero has been adopted by organizations of all sizes, from small educational institutions to government agencies and Global 100 enterprises. It is used by ITOps/SecOps teams, consulting pentesters, and MSSPs and MSPs. We are a fusion of former U.S. Special Operations cyber operators, startup engineers, and formerly frustrated cybersecurity practitioners. We're committed to helping solve our common security problems: ineffective security tools, false positives resulting in alert fatigue, blind spots, "checkbox” security culture, cybersecurity skills shortage, and the long lead time and expense of hiring outside consultants. Collectively, we are a team of learn it alls, committed to a culture of respect, collaboration, ownership, and results.
Requirements
- Ability to own and manage concurrent initiatives, with strong judgment in prioritization and time management.
- Self-directed and driven — capable of conceiving and implementing solutions independently and as part of a team.
- A strong desire to continuously learn new technologies in a fast-paced Agile environment.
- Excellent analytical and problem-solving skills, with attention to detail and a high bar for quality.
- Strong technical documentation ability to support an external developer audience.
- Effective communication and collaboration across engineering, product, and design.
- Interest in mentoring junior and mid-level engineers as the team grows.
- Bachelor's Degree in Computer Science, Computer Engineering, or a related field.
- 7+ years of professional software engineering experience using modern object-oriented or functional languages (Python, Go, TypeScript, Java, Scala, C++, etc.).
- Experience building production applications on cloud platforms (AWS, Azure, GCP) using Docker and Kubernetes.
Nice To Haves
- Expert proficiency in SQL, and experience with relational (PostgreSQL) and graph (Neo4j) database architectures.
- Hands-on experience building GraphQL backends, including federated graph architectures and schema evolution patterns.
- Experience designing and operating public API platforms — versioning, developer documentation, permission models, and multi-tenant access.
- Experience building or operating an integrations platform with reusable connector patterns, event-driven workflows (Kafka or similar), and asynchronous execution.
- Familiarity with OAuth/OIDC, service accounts, or machine identity patterns for programmatic API access.
- Experience integrating with third-party security or IT platforms — SIEMs, EDR tools, ticketing systems (e.g., CrowdStrike, Splunk, ServiceNow, Jira, Palo Alto), or workflow automation platforms.
- Experience with MCP, agentic frameworks, or other tool-protocol ecosystems.
- Production reliability experience: observability tooling (Datadog or similar), on-call ownership, vendor API drift handling, and safe failure design.
- Experience with customer-facing developer surfaces: CLI tooling, SDKs, or developer portals.
Responsibilities
- Design and implement backend APIs in GraphQL — including federated subgraph development, schema evolution, and multi-account query scoping for MSSP and multi-subsidiary customers.
- Build and extend the Integration Router: connector libraries, workflow configuration, secrets management, vendor adapters, and Kafka-triggered dispatch services.
- Own production reliability for API and integration services: monitoring, alerting, deployment, vendor API drift, rate limits, retries, and safe failure handling.
- Contribute to the MCP platform and OAuth proxy layer, including tool authentication and agentic workflow support.
- Contribute production code that sets the standard for design quality, code quality, and operational rigor.
- Collaborate with frontend engineers, product managers, and security-domain teams (particularly the Pentest Data Platform) to deliver integrated customer experiences.
- Mentor junior and mid-level engineers on the team as it scales.
Benefits
- health, vision & dental insurance for you and your family
- a flexible vacation policy
- generous parental leave
- equity package in the form of stock options
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What This Job Offers
Job Type
Full-time
Career Level
Senior
